v1.5 - category image to show in or out of stock

[Site]

Hi,

Im looking to revise the default v1.5 theme to show (in stock) or (preorder) message from the product page but display it as text over the image on the category page.

 

I guess it may be something to do with the following?

 

var availableNowValue = '{$product->available_now|escape:'quotes':'UTF-8'}';
var availableLaterValue = '{$product->available_later|escape:'quotes':'UTF-8'}';

 

 

 

 

I have attached a screenshot